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Revising Estimates of Aquatic Gross Oxygen Production by the Triple Oxygen Isotope Method to Incorporate the Local Isotopic Composition of Water Manning, Cara C.; Howard, Evan M.; Nicholson, David P.; Ji, Brenda Y.; Sandwith, Zoe O.; Stanley, Rachel H. R.
Abstract
Measurement of the triple oxygen isotope (TOI) composition of O₂ is an established method for quantifying gross oxygen production (GOP) in natural waters. A standard assumption to this method is that the isotopic composition of H₂O, the substrate for photosynthetic O₂, is equivalent to Vienna standard mean ocean water (VSMOW). We present and validate a method for estimating the TOI composition of H₂O based on mixing of local meteoric water and seawater H₂O end-members, and incorporating the TOI composition of H₂O into GOP estimates. In the ocean, GOP estimates based on assuming the H₂O is equivalent to VSMOW can have systematic errors of up to 48% and in low-salinity systems, errors can be a factor of 2 or greater. In future TOI-based GOP studies, TOI measurements of O2 and H₂O should be paired when the H₂O isotopic composition is expected to differ from VSMOW.
Item Metadata
Title |
Revising Estimates of Aquatic Gross Oxygen Production by the Triple Oxygen Isotope Method to Incorporate the Local Isotopic Composition of Water
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Creator | |
Publisher |
American Geophysical Union
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Date Issued |
2017-10-19
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Description |
Measurement of the triple oxygen isotope (TOI) composition of O₂ is an established method
for quantifying gross oxygen production (GOP) in natural waters. A standard assumption to this method
is that the isotopic composition of H₂O, the substrate for photosynthetic O₂, is equivalent to Vienna standard
mean ocean water (VSMOW). We present and validate a method for estimating the TOI composition of H₂O
based on mixing of local meteoric water and seawater H₂O end-members, and incorporating the TOI
composition of H₂O into GOP estimates. In the ocean, GOP estimates based on assuming the H₂O is
equivalent to VSMOW can have systematic errors of up to 48% and in low-salinity systems, errors can be
a factor of 2 or greater. In future TOI-based GOP studies, TOI measurements of O2 and H₂O should be
paired when the H₂O isotopic composition is expected to differ from VSMOW.
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Genre | |
Type | |
Language |
eng
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Date Available |
2018-04-19
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0357440
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URI | |
Affiliation | |
Citation |
Manning, C. C., Howard, E. M., Nicholson, D. P., Ji, B. Y., Sandwith, Z. O., & Stanley, R. H. R.(2017). Revising estimates of aquatic gross oxygen production by the triple oxygen isotope method to incorporate the local isotopic composition of water. Geophysical Research Letters, 44.
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Publisher DOI |
10.1002/2017GL074375
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Peer Review Status |
Reviewed
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Scholarly Level |
Researcher; Postdoctoral; Other
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Copyright Holder |
American Geophysical Union
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International